harris



(No Model.)

H. 0. HARRIS.

MACHINE FOR ROLLING METAL TUBES.

No. 578,873. Patented Dec. 29, 1896.

Wlnesses: v jm'flew w. & m

THE "cams vi'rcas co. moraumov, WASHINGTON. u. c

UNITED STATES PATENT OFFICE.

HUGH O. HARRIS, BROOKLYN, NEW YORK, ASSIGN OR TO THE SEAMLESS STRUCTURAL TUBE COMPANY, OF NEW YORK, N. Y.

MACHINE FO R ROLLING METAL TUBES.

SPECIFICATION formingpart of Letters Patent No. 573,873, dated December 29, 1896.

Application filed May 15,1896. Serial No. 591,654. (No model.) 7

To all whom it may concern.-

Be it known that I, HUGH O. HARRIS, of Brooklyn, New York, have invented an Improved Machine for Rolling Metal Tubes, of which the following is a specification.

This invention relates to a machine for reducing the thickness and outer diameter of a metal tubein a quick and effective manner. The machine is so constructed that friction is greatly reduced and that metal tubes of cylindrical and also of tapering form may be turned out.

In the accompanying drawings, Figure 1 is a side elevation, partly in section, of my improved machine for rolling metal tubes Fig. 2, a face view of the draw-head with the disk d removed; Fig. 3, an inner face view of the disk (Z; Fig. 4C, a horizontal section on line 4 4, Fig. 1; Fig. 5, an enlarged side view of the bulb and mandrel with the tube A in section, and Fig. 6 a detail of the bulb andmandrel.

The letter (t represents the frame of the machine, of which a? is the head-stock and a the live-spindle, which is driven from step:

pulley a in the manner usual in lathes. The

tube A to be reduced is adapted tobe connected to the spindle a by means of a clamp or chuck a so as to be axially revolved thereby. y

b is the slide-rest, which is reciprocated in the ordinary manner by connectionslfb and carries the annular draw-head c, which is adapted to encircle the workA. To the drawhead 0 there is secured a fixed disk (I, provided with four (more or less)radial ways or grooves cl. Within these grooves there are guided the radially-movable slides e, to the inner ends of which the reducing-rolls e are pivoted. These slides are provided, moreover, with the laterally-projectin g pins 6 engaged by the cam-grooves f of a second or oscillating disk f, between which and the disk cl the slides e are confined.

It will be seen that when the disk f is oscillated the slides will thereby be forced either inward or outward along the ways cl, so .as to decrease or increase the diameter of the draw-space formed between the rolls a.

Inorder to oscillate the disk f, it is provided with an arm f carryingaloose grooved g, the nut h is slackened, the block h adjusted by a turn of the set-screws, and the nut again tightened up to lock the rail in its new position. i

It will be seen that by lowering the rail g the arm f will be depressed and the diskf swung downward to move the slides e inward. On the other hand, by raising the rail 9 the arm f will be liberated, so that the frictional contact between the work and the rolls 6 will cause the disk f to be swung upward and the slides e to be moved outward until the roller f again contacts with the rail. By raising the right-hand end of the rail g slightly above theleft-hand end this outward movement of the slides will be effected gradually during the travel of the draw-head from left to right, and in this way the diameter of the drawspace will be gradually increased to form ta- 1 pering tubes.

To the draw-head a there is secured, by means of rods 7.: and a plate or spiderithone end of the mandrelj, which is adapted to be projected with its free end into the tube A to be drawn. This free end carries a head or a loose bulb'j, which is placed centrally be- 853 tween the reducing-rolls 6', so that the distance between the bulb and rolls represents the thickness to which the tube A is to be re duced. the work to be readily drawn off, and by making the working face of the mandrel revo luble friction is to a great extent avoided.

The operation of the machine is as follows: 7 The tube A to be reduced is connected to the live-spindle by clamp a so as to be aXially revolved. The draw-head c is moved to the left .andthe rail ,9 adjusted to forma draw-space of the desired width. Motion be ing imparted to the slide-rest, thedraw-head is made to travel along the tube so as to sub- I00 The head on the mandrel. permits ject each portion thereof to the action of the reducing-rolls. These: rolls, asv well as the bulb j, will be revolved by frictional contact with the tube A and will thus reduce its thickness in a quick and uniform manner.

The principal advantages connected with my invention are that the machine can be accurately adjusted to form cylindrical and tapering tubes of any desired thickness and that the machine works with a, minimum amount of friction.

lVhat I claim is- 1. In a machine for rolling metal tubes,the combination of a reciprocating draw-head With radially-adj ustable slides that form the draw-hole, and a mandrel secured to and longitudinally movable with the draw-head, substantially as. specified.

2. Ina machinefor rolling metal tubes, the combination of a reciprocating draw-head, with a disk cl, having: radial grooves d, a disk f, having cam-grooves f, aseries of radiallymovable slides e, having reducing-rolls e, and pins 0 and a mandrel which is secured to the draw-head and projects with its free end betweenthe rolls e, snbstantiallyas specified.

3. In a machine for rolling metal tubes, the combination of a reciprocating draw-head with radially-movable slides, an oscillating disk having cam-grooves engaging the same, a rail for lockingthe disk, a man-drel secured to thedraw-head, a live-spindle, and means for attaching the Work to such spindle, substantially as specified.

4. In a machine for rolling metal tubes, the combination of the following elements: a reciprocating draW-head,a fixed disk having radial grooves, an oscillating disk having camgrooves, slides engaging the disks, a mandrel secured to the draw-head, a rail engaging the oscillating disk, means for adjust-- ing said rail,a live-spindle and means for locking the, Work to such spindle, substantially as specified.

HUGH O. HARRIS.

Witnesses F. v. BRIESEN, WILLIAM SCH-ULZ. 

